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This commit started as adding rv32e support to gdb. The rv32e architecture is a cut-down rv32i, it only has 16 x-registers compared to the usual 32, and an rv32e target should not have any floating point registers. In order to add this I needed to adjust the target description validation checks that are performed from riscv_gdbarch_init, and I finally got fed up with the current scheme of doing these checks and rewrote this code. Unfortunately the rv32e changes are currently mixed in with the rewrite of the validation scheme. I could split these apart if anyone is really interested in seeing these two ideas as separate patches. The main idea behind this change is that where previously I tried to have a purely data driven approach, a set of tables one for each expected feature, and then a single generic function that would validate a feature given a table, I have created a new class for each feature. Each class has its own check member function which allows the logic for how to check each feature to be different. I think the new scheme is much easier to follow. There are some other changes that I made to the validation code as part of this commit. I've relaxed some of the checks related to the floating point CSRs. Previously the 3 CSRs fflags, frm, and fcsr all had to be present in either the fpu feature or the csr feature. This requirement is now relaxed, if the CSRs are not present then gdb will not reject the target description. My thinking here is that there's no gdb functionality that specifically requires these registers, and so, if a target offers a description without these registers nothing else in gdb should stop working. And as part of the rv32e support targets now only have to provide the first 16 x-registers and $pc. The second half of the x-registers (x16 -> x31) are now optional. gdb/ChangeLog: * arch/riscv.c: Include 'rv32e-xregs.c'. (riscv_create_target_description): Update to handle rv32e. * arch/riscv.h (struct riscv_gdbarch_features) <embedded>: New member variable. <operator==>: Update to account for new field. <hash>: Likewise. * features/Makefile (FEATURE_XMLFILES): Add riscv/rv32e-xregs.xml. * features/riscv/rv32e-xregs.c: Generated. * features/riscv/rv32e-xregs.xml: New file. * riscv-tdep.c (riscv_debug_breakpoints): Move from later in the file. (riscv_debug_infcall): Likewise. (riscv_debug_unwinder): Likewise. (riscv_debug_gdbarch): Likewise. (enum riscv_register_required_status): Delete. (struct riscv_register_feature): Add constructor, delete default constructor, copy, and assign constructors. (struct riscv_register_feature::register_info) <required>: Delete. <check>: Update comment and arguments. (struct riscv_register_feature) <name>: Change to member function. <prefer_first_name>: Delete. <tdesc_feature>: New member function. <registers>: Rename to... <m_registers>: ...this. <m_feature_name>: New member variable. (riscv_register_feature::register_info::check): Update arguments. (riscv_xreg_feature): Rewrite as class, create a single static instance of the class. (riscv_freg_feature): Likewise. (riscv_virtual_feature): Likewise. (riscv_csr_feature): Likewise. (riscv_create_csr_aliases): Has become a member function inside riscv_csr_feature class. (riscv_abi_embedded): New function definition. (riscv_register_name): Adjust to use new feature objects. (struct riscv_call_info) <riscv_call_info>: Check for rv32e abi, and adjust available argument registers. (riscv_features_from_gdbarch_info): Check for EF_RISCV_RVE flag. (riscv_check_tdesc_feature): Delete. (riscv_tdesc_unknown_reg): Adjust to use new feature objects. (riscv_gdbarch_init): Delete target description checking code, and instead call to the new feature objects to perform the checks. Reorder handling of no abi information case, allows small code simplification. (_initialize_riscv_tdep): Remove call, this is now done in the riscv_csr_feature constructor. * riscv-tdep.h (riscv_abi_embedded): Declare. |
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| config | ||
| contrib | ||
| cpu | ||
| elfcpp | ||
| etc | ||
| gas | ||
| gdb | ||
| gdbserver | ||
| gdbsupport | ||
| gnulib | ||
| gold | ||
| gprof | ||
| include | ||
| intl | ||
| ld | ||
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| libdecnumber | ||
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| ar-lib | ||
| ChangeLog | ||
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| configure | ||
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| depcomp | ||
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| install-sh | ||
| libtool.m4 | ||
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| MAINTAINERS | ||
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| multilib.am | ||
| README | ||
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README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.